CN114475370A - Short circuit sectional protection method for contact network of cable through power supply system - Google Patents
Short circuit sectional protection method for contact network of cable through power supply system Download PDFInfo
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- CN114475370A CN114475370A CN202210246702.2A CN202210246702A CN114475370A CN 114475370 A CN114475370 A CN 114475370A CN 202210246702 A CN202210246702 A CN 202210246702A CN 114475370 A CN114475370 A CN 114475370A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a short-circuit subsection protection method for a contact network of a cable through power supply system, wherein each traction transformer of the contact network is segmented and set as a traction station, each traction station comprises a traction transformer, a feeder line current transformer and a feeder line breaker, two adjacent traction stations form a segmented loop, each segment is provided with a fault component measurement and control unit, the secondary side of the current transformer corresponding to the segment is connected with the input end of the fault component measurement and control unit, the output end of the fault component measurement and control unit is connected with the control end of the breaker of the traction station, and each fault component measurement and control unit is connected with a dispatching room through a transmission network. According to the method, the transient sampling value of the fault component current forms the section protection of the longitudinal difference current of the contact network, the fault section loop of the contact network can be accurately cut off, but not the fault section loop, can continuously operate, the fault range is reduced to the minimum, the method is not influenced by load current and the distributed capacitance of the contact network, and the capacity of allowing transition resistance is improved.
Description
Technical Field
The invention belongs to the technical field of electrified railway contact network protection, and particularly relates to a short-circuit sectional protection method for a contact network of a cable through power supply system.
Background
The electrified railway in China is a single-phase power frequency alternating current power supply system, in order to solve the problem of unbalanced three-phase voltage of a power system caused by single-phase power consumption, traction substations of the existing traction power supply system in China all adopt a method for changing a phase sequence, a subarea station can be formed among different power supply arms by the method, electric phase splitting can be caused by the subarea station, various accidents can be caused when a train passes through the electric phase splitting, and therefore the problem that the electric phase splitting is urgently needed to be solved in China is to be cancelled or reduced. The power supply capacity of the cable is stronger than that of an overhead line with the same voltage class, and the distance of a power supply arm is greatly increased, so that the through power supply of the cable is one of effective methods for reducing the power phase of a subarea.
The safety operation of the contact network of the cable through power supply system is a very important link, each section loop of the contact network under the system is supplied with power by the traction transformers on two sides together, and the system is similar to a double-side power supply mode, so that the protection scheme of the system is different from the existing single-side power supply mode, and the system is one of the problems to be solved by the application. And after the overhead line system adopts the sectionalized protection, how to guarantee that the fault is accurately and quickly removed after the fault occurs in a certain overhead line system sectionalized loop, and the overhead line system sectionalized loop circuit breaker which does not have the fault is reliable and does not malfunction, so that the power failure range is reduced to the lowest extent, and the whole overhead line system is not broken down, thereby improving the power supply reliability is another problem to be solved by the application.
Disclosure of Invention
The invention aims to overcome the defects of the existing protection scheme, provides a short-circuit sectional protection method for a contact network of a cable through power supply system, not only provides a short-circuit protection scheme with a bilateral power supply mode, but also can accurately and quickly cut off a faulted contact network sectional loop, and the faulted contact network sectional loop continues to operate, so that the power failure range is reduced to the lowest extent, and the power supply reliability of the contact network is improved.
The technical scheme adopted by the invention is as follows:
a short circuit sectional protection method for a contact network of a cable through power supply system comprises the following steps: the method comprises the steps that a contact net of a cable through power supply system is segmented, the segmentation mode is that each traction transformer of the contact net is segmented and set as a traction station, a segmentation loop is formed between every two adjacent traction stations, each traction station comprises a traction transformer, a first feeder circuit breaker, a second feeder circuit breaker, a first feeder current transformer and a second feeder current transformer, wherein the primary side of each first feeder current transformer and the primary side of each second feeder current transformer are connected with the output of the traction transformer, the secondary side of each first feeder current transformer is connected with the contact net through the first feeder circuit breaker, the secondary side of each second feeder current transformer is connected with the contact net through the second feeder circuit breaker, all feeder circuit breakers are in a normally closed state, and the types and transformation ratios of the feeder current transformers of each traction station are the same;
each segmented loop is provided with a fault component measurement and control unit, and the connection mode of the fault component measurement and control units is as follows: defining any two adjacent traction places as a first traction place and a second traction place, wherein a branch formed by a second feeder current transformer and a second feeder circuit breaker of the first traction place is adjacent to a branch formed by a first feeder current transformer and a first feeder circuit breaker of the second traction place, defining two feeder circuit breakers adjacent to the two traction places in a section as the adjacent feeder circuit breakers of the section, and then inputting a fault component measurement and control unit into a secondary side of the second feeder current transformer of the first traction place and a secondary side of the first feeder current transformer of the second traction place, and outputting the fault component measurement and control unit as a control end of the adjacent feeder circuit breakers of the section; each section controls the circuit breaker of the section adjacent feeder line of the section through a fault component measurement and control unit, and the specific control method comprises the following steps:
the fault component measurement and control unit samples the instantaneous value of the current for N times in a power frequency period, and judges whether S data in the continuous R data meet the following conditions in the obtained current sampling value:
wherein Δ ii1、Δi(i-1)2Fault component feeder currents, i, of two branches adjacent to the traction in a segmentzdIs a constant value0, to prevent the device from malfunctioning for some reason when the line is empty or dropped<k is less than or equal to 1 and is a braking coefficient;
if yes, the fault component measurement and control unit judges that the short circuit of the contact network occurs in the traction of the corresponding section, at the moment, the fault component measurement and control unit drives the control end of the adjacent feeder circuit breaker of the section to enable the adjacent feeder circuit breaker of the section to be switched off, and otherwise, the adjacent feeder circuit breaker of the section keeps switched on.
Further, the fault component feeder current is extracted by the following formula:
Δi(m)＝i(m)-i(m-N) (2)
where m is a sampling number, m is 1,2,3 …, Δ i (m) is a fault component current sampling value of the mth time, i (m) is a current sampling value of the mth time, i (m-N) is a current sampling value before N sampling points, and N is a sampling number of times per power frequency period.
The invention has the beneficial effects that:
the invention provides a relay protection scheme of a cable through power supply system contact network similar to bilateral power supply.
The invention can accurately and quickly cut off the sectional circuit of the contact network fault, and the faultless sectional circuit breaker of the contact network is reliable and does not malfunction, thereby reducing the power failure range to the lowest and improving the power supply reliability of the contact network.
The action characteristic of the invention is not influenced by traction load current and the capacitance of a contact network to the ground, and theoretically, the action characteristic cannot be influenced as long as the transition resistance of a short-circuit point is not infinite, so that the capacity of allowing the transition resistance is improved.
Drawings
Fig. 1 is a schematic view of a topology structure of a cable through power supply system according to the present invention.
Fig. 2 is a schematic structural view of a contact line segment protection and traction station according to the present invention.
Fig. 3 is a schematic structural diagram of a fault measurement and control unit according to the present invention.
Fig. 4 is a flowchart illustrating the operation of the present invention.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings and embodiments:
fig. 2 shows: each traction transformer QYB of the contact network is segmented and arranged into traction stations QYS, and a segmented loop FD is formed between every two adjacent traction stations QYS; the traction substation QYS comprises a traction transformer QYB, a feeder breaker QF, a feeder current transformer CT; the feeder breaker QF is normally in a closed state; the CT type and the transformation ratio of the feeder line current transformer of each traction station QYS are the same; towing post QYSi-1And a towing post QYSiForm a section FD1, a towing post QYSiAnd a towing post QYSi+1Constituting segment FD 2.
Fig. 3 shows a schematic structural diagram of a fault component measurement and control unit CK according to an embodiment of the present invention. Each segmented loop is provided with a fault component measurement and control unit CK and a traction station QYSi-1The feeder line current transformer CT(i-1)2Secondary side and traction station QYSiThe feeder line current transformer CTi1Secondary side access fault component measurement and control unit CK1The input terminal of (2), the fault component measurement and control unit CK1The output end of the same feeder circuit breaker QF(i-1)2And QFi1The control ends are connected; towing post QYSiThe feeder line current transformer CTi2Secondary side and traction station QYSi+1The feeder line current transformer CT(i+1)1Secondary side access fault component measurement and control unit CK2The input terminal of (2), the fault component measurement and control unit CK2The output end of the same feeder circuit breaker QFi2And QF(i+1)1The control ends are connected; the current transformer is positive in the direction that current flows into the section FD; each fault component measurement and control unit CK is connected with a dispatching room through a transmission network; each fault component measurement and control unit CK samples the instantaneous value of the current for N (N is generally 12) times in one power frequency period.
Fig. 2 also shows an application schematic diagram of each section and traction station of the overhead line system of the cable through power supply system in the embodiment of the invention. Corresponding to FIG. 3, a towing post QYSi-1The feeder line current transformer CT(i-1)2Secondary side and traction station QYSiThe feeder line current transformer CTi1Secondary side access fault component measurement and control unit CK1An input terminal of (1); towing post QYSiThe feeder line current transformer CTi2Secondary side and traction station QYSi+1The feeder line current transformer CT(i+1)1Secondary side access fault component measurement and control unit CK2To the input terminal of (1). When the section FD2 has a short-circuit fault of the overhead line system, the position shown in the figure is the traction station QYSiThe feeder line current transformer CTi2Minor edge and draw station QYSi+1The feeder line current transformer CT(i+1)1The fault component current measured by the secondary side has S times to satisfy
Then the failure component measurement and control unit CK2Driving feeder breaker QFi2And QF(i+1)1The control end of the section FD2 is switched off, so that the short-circuit fault of the contact network of the section FD2 is cut off, and the feeder circuit breaker QF of the section FD1 without the fault is cut off(i-1)2And QFi1Not actuated, by towing station QYSi-1And QYSiAnd the power supply operation is continued, and the power failure range is reduced to the lowest.
Fig. 4 illustrates the workflow of the present invention. According to the working principle of the invention: the fault component feeder line current on the left side and the right side of a certain contact net sectional loop meets the requirement of S times in N continuous sampling values of a cycle wave
Therefore, the fault component current sampling value longitudinal differential protection is formed to cut off the short-circuit fault of the contact network. The specific working process is as follows: towing post QYSi-1The feeder line current transformer CT(i-1)2Secondary side and traction station QYSiThe feeder line current transformer CTi1The fault component current measured on the secondary side satisfies S times
Fault component measurement and control unit CK1Determining a traction institute QYSi-1And a towing post QYSiThe section FD1 between the fault measurement and control units CK has a short-circuit fault of the contact network1Drive traction station QYSi-1Breaker QF(i-1)2And a towing post QYSiBreaker QFi1Control end makes itOpening, otherwise breaker QF(i-1)2And QFi1Still keeping closing; towing post QYSiThe feeder line current transformer CTi2Secondary side and traction station QYSi+1The feeder line current transformer CT(i+1)1The fault component current measured on the secondary side satisfies S times
Fault component measurement and control unit CK2Determining a traction institute QYSiAnd a towing post QYSi+1The section FD2 between the fault measurement and control units CK has a short-circuit fault of the contact network2Drive traction station QYSiBreaker QFi2And a traction substation QFi+1Breaker QF(i+1)1The control end enables the breaker to be opened, otherwise the breaker QFi2And QF(i+1)1Still remains closed.
And the short circuit and the breaker tripping information are sent to the adjacent dispatching rooms by the fault component measurement and control unit of each section through a transmission network. To achieve synchronous sampling of the instantaneous value of the current across the line, GPS technology can be used. The fault component measurement and control unit can judge the fault by means of a microcomputer protection device.
Example (b):
referring to fig. 1, the topology of the cable through power supply system including three traction transformers, i.e. two segmented loops, is divided into 110kV traction cables (power supply cables C)1And a return cable C2) 110kV/27.5kV traction transformer and 27.5kV contact net-steel rail. The primary side of a main substation (MSS) is connected with a 220kV power system, and the secondary side output end of the MSS is connected with a 110kV power supply cable and a return cable respectively. The traction transformer is connected with a power supply cable and a return cable on the primary side and a contact net-steel rail on the secondary side at a certain distance, so that through power supply is realized. The lengths of the left subsection loop and the right subsection loop are respectively 25km and 30km, the left subsection loop locomotive is located at a position 5km away from a traction transformer No. 1, the right subsection loop locomotive is located at a position 10km away from a traction transformer No. 2, the locomotives are simulated by a constant power model, P is 20MW, and the power factor is 0.98 (lag). The right segmented loop is contacted at a distance of 10km from the No. 3 traction transformer in 0.05sThe net is shorted. The left contact net subsection loop and the right contact net subsection loop of the figure 1 respectively correspond to the subsection FD1 and the subsection FD2 of the figure 2, and the symbol marks also correspond to those shown in the figure 2. Fault component instantaneous value delta i of the left and right sides of segment FD1(i-1)2、Δii1And fault component current transients Δ i to the left and right of segment FD2i2、Δi(i+1)1Sampling for 12 times, R is 6, S is 4, izdThe fixed value is 0.5A, k is 1, the current transformer transformation ratio is 1000/1, and the fault component current | delta i of the section FD1 is obtained(i-1)2+Δii1|、|Δi(i-1)2-Δii1Fault component current | Δ i of | and segment FD2i2+Δi(i+1)1|、|Δii2-Δi(i+1)1The | are recorded in table 1. The current unit is a.
TABLE 1 Fault component Current recording
| Number of samplings | |Δi(i-1)2+Δii1| | |Δi(i-1)2-Δii1| | |Δii2+Δi(i+1)1| | |Δii2-Δi(i+1)1| |
| 1 | 0.022 | 0.068 | 0.756 | 0.150 |
| 2 | 0.084 | 0.332 | 3.480 | 0.828 |
| 3 | 0.116 | 0.708 | 7.365 | 1.643 |
| 4 | 0.115 | 1.049 | 11.058 | 2.368 |
| 5 | 0.076 | 1.220 | 13.242 | 2.762 |
| 6 | 0.011 | 1.161 | 13.402 | 2.740 |
| 7 | 0.304 | 0.482 | 11.139 | 2.243 |
| 8 | 0.120 | 0.382 | 7.222 | 1.448 |
| 9 | 0.149 | 0.189 | 2.125 | 0.451 |
| 10 | 0.144 | 0.682 | 2.614 | 0.442 |
| 11 | 0.105 | 0.969 | 5.699 | 0.991 |
| 12 | 0.036 | 1.012 | 6.693 | 1.117 |
It can be seen from the table that the segment FD2 can always find 4 satiations out of 12 samples for 6 consecutive times
Then the failure component measurement and control unit CK2Drive traction station QYSiBreaker QFi2And a traction substation QFi+1Breaker QF(i+1)1The control end enables the control end to open the brake and remove the fault; none of the sampling points of the segment FD1 are satisfied
Therefore, the fault component measurement and control unit CK of the non-fault section FD11QF control circuit breaker(i-1)2And QFi1And the switch-on state is still kept, and normal operation is continued. The visible failure range is reduced to a minimum.
Claims (2)
1. A short-circuit sectional protection method for a contact network of a cable through power supply system is characterized in that the contact network of the cable through power supply system is segmented, the segmentation mode is that each traction transformer of the contact network is segmented and is arranged as a traction station, a segmented loop is formed between two adjacent traction stations, each traction station comprises a traction transformer, a first feeder circuit breaker, a second feeder circuit breaker, a first feeder current transformer and a second feeder current transformer, the primary side of the first feeder current transformer and the primary side of the second feeder current transformer are connected with a traction transformer for output, the secondary side of the first feeder current transformer is connected with a contact network through a first feeder circuit breaker, the secondary side of the second feeder current transformer is connected with the contact network through a second feeder circuit breaker, all feeder circuit breakers are in a normally closed state, and the type and the transformation ratio of each traction feeder current transformer are the same;
each segmented loop is provided with a fault component measurement and control unit, and the connection mode of the fault component measurement and control units is as follows: defining any two adjacent traction places as a first traction place and a second traction place, wherein a branch formed by a second feeder current transformer and a second feeder circuit breaker of the first traction place is adjacent to a branch formed by a first feeder current transformer and a first feeder circuit breaker of the second traction place, defining two feeder circuit breakers adjacent to the two traction places in a section as the adjacent feeder circuit breakers of the section, and then inputting a fault component measurement and control unit into a secondary side of the second feeder current transformer of the first traction place and a secondary side of the first feeder current transformer of the second traction place, and outputting the fault component measurement and control unit as a control end of the adjacent feeder circuit breakers of the section; each section controls the circuit breaker of the section adjacent feeder line of the section through a fault component measurement and control unit, and the specific control method comprises the following steps:
the fault component measurement and control unit samples the instantaneous value of the current for N times in a power frequency period, and judges whether S data in the continuous R data meet the following conditions in the obtained current sampling value:
wherein Δ ii1、△i(i-1)2Fault component feeder currents, i, of two branches adjacent to the traction in a segmentzdIs a constant value, 0<k is less than or equal to 1 and is a braking coefficient;
if yes, the fault component measurement and control unit judges that the short circuit of the contact network occurs in the traction of the corresponding section, at the moment, the fault component measurement and control unit drives the control end of the adjacent feeder circuit breaker of the section to enable the adjacent feeder circuit breaker of the section to be switched off, and otherwise, the adjacent feeder circuit breaker of the section keeps switched on.
2. The short-circuit sectional protection method for the overhead line system of the cable through power supply system according to claim 1, wherein the fault component feeder current is extracted by the following formula:
△i(m)＝i(m)-i(m-N)
where m is a sampling number, m is 1,2,3 …, Δ i (m) is a fault component current sampling value of the mth time, i (m) is a current sampling value of the mth time, i (m-N) is a current sampling value before N sampling points, and N is a sampling number of times per power frequency period.
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